hi! i need someone to help us plan the itinerary of my parents, sister (3 adults in all) and my 3 kids ages 7, 6 and 5. they would be going to Hong kong on the 12th of november. on the 13th, they are planning to take the MTR from yau ma tei station to admiralty station so they can take a bus to go to ocean park. what would be the best card for them to use that would be convenient and economical? how much would it cost? they are also planning to go to disneyland. would greatly appreciate a response to this. thanks